Mobile excavators and dumpers for confined construction sites and difficult terrain

Construction machinery is often defined by its performance data: engine power, digging depth or payload. In practical use, however, other factors often determine productivity.

Space constraints in city centres, difficult terrain or safety requirements on construction sites present operators with challenges that cannot be solved by increased power alone. At bauma, Hydrema is presenting machine concepts that address precisely these issues. The focus is on a compact mobile excavator with exceptional boom kinematics and an articulated dumper designed to impress with its traction, visibility and lightweight construction. The Danish company has also been manufacturing in Weimar since the 1990s and has deliberately positioned itself in the premium segment.

Hydrema MX-14 focuses on compact dimensions and high manoeuvrability

The MX-14 mobile excavator is particularly striking. Although machines of this class are a common sight on many construction sites, this model takes an unusual approach. The focus is on the smallest possible swing radii and a particularly compact design. According to the manufacturer, the machine has the shortest rear overhang in its class. At around 1.55 metres, the rear overhang remains very compact even during slewing movements. At the same time, the front slewing radius has been reduced. This is made possible by a special boom kinematics system that can bring the working tool exceptionally close to the machine.

As a result, the excavator can work almost entirely within its own footprint. This offers particular advantages on inner-city construction sites, during roadworks or in narrow excavations, as less space is required for slewing movements. A further benefit is evident when loading lorries. The boom can be retracted a long way, whilst the bucket can still be opened in a controlled manner. This makes working in confined spaces easier.

Four operating modes allow the MX-14’s power to be utilised more effectively

The current generation of the City excavator was also developed based on customer feedback. A key focus was on adapting engine speeds to different operating conditions. The MX-14 features four pre-set power levels:

• Silent Mode at 1,500 revolutions per minute
• City Mode at 1,700 rpm
• Standard Mode at 2,000 rpm
• Power Mode at 2,200 rpm

It is worth noting that even in Silent Mode, an output of around 146 hp is available. The maximum engine power is 167 hp and, according to the manufacturer, is among the highest figures in the up to 16-tonne class. The different power settings are designed to prevent the machine from being operated continuously at maximum speed. Many tasks can be carried out at lower speeds, which can reduce fuel consumption, noise levels and wear and tear.

Two-way excavator demonstrates advantages on the rails

In addition to the classic mobile excavator design, Hydrema is also showcasing a rail variant as a two-way excavator. Such machines are used for work in track areas and often have to operate in confined spaces. It is precisely here that the short swing radii become particularly evident. Whilst many machines extend far beyond their footprint when turning, the turning circle here remains comparatively small. This facilitates work along tracks, platforms or other infrastructural bottlenecks. The trend towards more compact machines is evident in many areas of the construction industry. Construction sites are increasingly located in densely built-up areas, whilst at the same time higher demands are being placed on safety and productivity.

Dumpers with tandem axles for maximum traction

Alongside excavators, articulated dumpers are among the manufacturer’s key products. At the exhibition stand, a model is demonstratively positioned at an extreme angle to illustrate the chassis’s capabilities. At the heart of the design is the so-called bogie or tandem axle. It ensures that all wheels maintain as constant contact with the ground as possible. Special compensation angles distribute the load in such a way that traction is maintained even on uneven ground.

This is a key factor for construction sites with varying ground conditions, mud or steep gradients. At the same time, the design protects the machine from loss of traction and enhances driving stability. Another feature is the internal tipping cylinders. They are protected from external damage and allow for a large tipping angle of the body. This enables material to be reliably unloaded even on slopes.

Lightweight construction and good visibility improve efficiency in everyday construction site operations

In addition to traction and off-road capability, safety also plays an important role. The cab has been designed to give the driver the clearest possible view of the working environment. Good visibility reduces risks and makes manoeuvring on tight construction sites easier. Added to this is a consistent focus on lightweight construction. The use of high-strength steels means certain reinforcements are no longer required. The machines remain stable, yet weigh less.

This reduces ground pressure and can lower fuel consumption. This results in economic benefits, particularly during frequent transport journeys or on sensitive ground. The machines on display at bauma demonstrate that innovation does not necessarily mean ever-larger machines. Instead, the focus is on features such as manoeuvrability, efficiency, visibility and adaptability. For many construction sites, it is precisely these characteristics that are crucial for carrying out work more quickly, safely and economically.